Valve, and package

Abstract

A pressure-relief valve includes a cup shaped main body with a bottom and a circumferential wall to be fastened to a flexible package material. The bottom has at least one through hole forming a passage through the main body. A valve membrane lies against the main body on a package side in a region around the through hole(s), with a sealing liquid between the main body and the valve membrane. The valve membrane thereby covers the at least one through hole. On the package side, the bottom has a system of grease grooves for accommodating a portion of the sealing liquid, the system of grease grooves comprising at least one outer grease groove having a main portion running in a circumferential direction and having a radial extension extending from the main portion into a radial direction.

1 . Pressure-relief valve, the valve comprising a cup shaped main body, with a bottom and a circumferential wall, equipped to be fastened to a flexible package material, the bottom having at least one through hole forming a passage through the main body, a valve membrane lying against the main body on a package side in a region around the at least one through hole, and a sealing liquid between the main body and the valve membrane, wherein the bottom, on the package side, has a system of grease grooves for accommodating a portion of the sealing liquid, the system of grease grooves comprising at least one outer grease groove having a main portion running in a circumferential direction and having a radial extension extending from the main portion into a radial direction. 
     
     
         2 . The valve according to  claim 1 , wherein the system of grease grooves comprises at least one circular array of at least two first outer grease grooves. 
     
     
         3 . The valve according to  claim 2 , wherein the system of grease grooves further comprises at least one circular array of at least two second outer grease grooves, the first outer grease grooves being arranged around the second outer grease grooves, and the second outer grease grooves being staggered with respect to the first outer grease grooves. 
     
     
         4 . The valve according to  claim 3 , where at least one of the first outer grease grooves has a radial extension being an inward extension extending inwardly between the second outer grease grooves. 
     
     
         5 . The valve according to  claim 3 , wherein at least one of the second outer grease grooves has a radial extension being an outward extension extending outwardly between the first outer grease grooves. 
     
     
         6 . The valve according to  claim 1 , wherein the system of grease grooves further comprises an inner grease groove extending around the at least one through hole. 
     
     
         7 . The valve according to  claim 6 , wherein the at least one outer grease groove is deeper than the inner grease groove. 
     
     
         8 . The valve according to  claim 1 , wherein the radial extension or at least one of the radial extensions is an inward extension, and wherein, when the valve membrane lies against the main body, a shortest path along the valve membrane between a volume communicating with the at least one through hole and any other hollow space leads from said volume communicating with the at least one through hole to an innermost point of the inward extension. 
     
     
         9 . The valve according to  claim 1 , wherein at least one component of the valve is made of a polymer composition comprising a water-soluble polymer. 
     
     
         10 . The valve according to  any one of the previous claim 1 , being bio-degradable. 
     
     
         11 . The valve according to  claim 1 , further comprising a permeable membrane being a fabric secured to the main body to cover the at least one through hole on a product side opposite the package side. 
     
     
         12 . The valve according to  claim 1 , wherein the main body has a system of ventilation grooves, with spacers between them, the mouth of the through hole or the at least one of the through holes being in a ventilation groove. 
     
     
         13 . The valve according to  claim 1 , further comprising a fixing part fixed relative to the circumferential wall so that the valve membrane is sandwiched between the bottom and the fixing part. 
     
     
         14 . A package for packaging food products, the package comprising a flexible, pliant packaging material as well as a pressure relief valve according to  claim 1 , wherein the main body is attached to the packaging material.